MEMO 2017 ekipno problem 8


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Sept. 12, 2018
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For an integer n \geqslant 3 we define the sequence \alpha_1, \alpha_2, \ldots, \alpha_k as the sequence of exponents in the prime factorization of n! = p_1^{\alpha_1}p_2^{\alpha_2} \ldots p_k^{\alpha_k}, where p_1 < p_2 < \ldots < p_k are primes. Determine all integers n \geq 3 for which \alpha_1, \alpha_2, \ldots, \alpha_k is a geometric progression.

Source: Srednjoeuropska matematička olimpijada 2017, ekipno natjecanje, problem 8